Fuel-injection nozzle, especially for light-oil injection motors



' March 19, 1940. SCHUTTLER AL 2,194,236

FUEL-INJECTION NOZZLE, ESPECIALLY FOR LIGHT-OIL INJECTION MOTORS Filed June 18, 1-957 Fig.7

Patented Mar. 19, 1940 FUEL-INJECTION NOZZLE, ESPECIALLY FOR LIGHT-OIL INJECTION'MOTORS Paul -Schiittler and Joseph Vollmer, Berlin- Charlottenburg, Germany, assignors to Pallas Apparate G. m. b. H'., Berlin, Germany Application June 18, 1937, Serial No. 149,01 Germany July 9, 1936 I 2 Claims. (01. 299-1071) I In contradistinction to injection motors in which a heavy oil is used, the operation of lightoil injection-motors encounters additional difficulties due to the fact that the boiling point of light oils is considerably below the boiling point of heavy oils, in consequence whereof gas bubbles arise in theinjection nozzle, which bubbles either impair the accurate supply of the small amount of fuel by the fuel pump or stop it completely.

The nozzle is shielded from the intense heat of the burning fuel by its location at the exterior of the engine casing, and the conduction of heat to the nozzle is limited to a low value by the limited contact areas between the casing 3 and the inner end of the nozzle, and between the 6 screw 4 and the outer end of the nozzle. The heat-insulating gasket 6 effects a further reduction in the heat transfer to the nozzle from the cooled engine wall 3. No difficulty has been 10 The object of the present invention is to ob experi d in p ratin w th li ht fu l oil as 10 viate the just-mentioned drawback, and for this the described nozzle is not heated to temperapurpose the transmission of heat from the motor "tures that cause vaporization of the light fuel body which is cooled by water or air to the inwithin the nozzle. jectionnozzle is reduced to a minimum, in that We claim: I

this nozzle is arranged outside the motor body 1. In combination with an internal combus- 15 and is in contact with it directly onlyat the t engine f t ty employing .li ht o l as place of injection, and indirectly only by certain q i fuel Which Com-P115858 casing havin Walls outer holding means for said nozzle, defining a cylinder and a recess adapted to re- The invention is illustrated diagrammatically ceive a fuel injection nozzle, the wall at the base and by way 'of example on the accompanying 0f the recess having a nozzle seat at its exterior drawing on which Figure 1 is a transverse vertical Surface and a fuel pas ge extending throu h section through the portions conc rn d f ulsaid wall from the nozzle seat to the interior of time light-oil injection motor designed accordthe cylinder, a fuel injection nozzle spaced from ing to this invention, and Figure 2 is an axial secd Communicating with Said cylinder through tion through the left-hand half of Fig. 1. said fue passa e, said no le having i y po 25 In the drawing the reference numeral l identitiOn concentrically p ced r e Walls Of Said fies an injection nozzle for supplying li ht 11 recess and in contact with said engine'casing at to the fuel passage 2 that exte d through only two surfaces, namely, at the orifice tip which water-cooled wall portion of the engine casing 3.' engages said nozzle seat throu a e ricted ar The nozzle is held in place at the exterior of the and at a m g Point at e Outer n f the 30 engine casing bya clamp bolt 4 in a clamp arm nozzle, a d a p g means enga Sa d 5 which is supported from the engine casing by clamping point of the nozzle for maintaining the t studs 8. The cooperating contact surfaces at the nozzle in p tion, whereby h conduc ion of inner end of the nozzle l and the exterior surface h from h engine casing to Said nozzle is of the engine casing at the fuel inlet 2 may be 'stricted to a'minimumv curved or flat, as desired, so long as a tight joint 2. The invention as claimed in claim 1 wherein is formed. A gasket 5 of low heat conductivity a gasket of w t conductivity isarran ed bemay be arranged between the nozzle and the en-,- tween the nozzle dy nd the nozzle seat of gine casing to reduce heat transfer at this point, ai engine n 40 and cooling fins 1 may be formed on the nozzle l. PAUL SCI-IfiTI'LER.

JOSEPH VOLLMZER. 

